package com.itheima.interceptor;

import com.itheima.utils.JwtUtils;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * 令牌拦截器
 */
@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取到请求路径
        String requestURI = request.getRequestURI();
        //2.判断是否是登录请求,如果路径中包含/login,说明是登录操作,放行请求
        if (requestURI.contains("/login")) {
            log.info("登录请求,放行");
            return true;
        }
        //3.获取请求头中的token
        String token = request.getHeader("token");
        //4.判断token是否存在,如果不存在,说明是未登录的请求,返回未登录的响应
        if (token == null || token.isEmpty()) {
            log.info("令牌为空,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //5.如果token存在,校验令牌,如果校验通过,放行请求,如果校验不通过,返回未登录的响应
        try {
            JwtUtils.parseToken(token);
        } catch (Exception e) {
            log.info("令牌非法,响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //6.校验通过,放行
        log.info("令牌合法,放行");
        return true;
    }
}
